Newton's contribution to physics: MCQ with Answer and Explanation

Question
Newton's contribution to physics:
A. Theory of relativity
B. Laws of motion and gravitation
C. Quantum mechanics
D. Electromagnetic theory
Answer: Option B
Solution (By JKSSB Mock Tests)
Isaac Newton: three laws of motion, universal gravitation, calculus, optics. Relativity: Einstein; EM theory: Maxwell; Quantum: Planck/Bohr. Memory tip: 'Newton = classical mechanics foundation'. Scientist-discovery association frequently tested in competitive exams.
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Question #1
The velocity of a body changes from 2 m/s to 10 m/s in 4 s. Distance covered in this time is (assuming constant acceleration)
A. 24 m
B. 32 m
C. 48 m
D. 16 m
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Correct Answer: Option A

Explanation:
a = (10-2)/4 = 2 m/s². s = 2×4 + ½×2×16 = 8+16=24 m. Or average velocity 6 m/s ×4=24.
This question belongs to: Science Physics
Question #2
The efficiency of a Carnot engine working between 27°C and 127°C is
A. 75%
B. 25%
C. 50%
D. 100%
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Correct Answer: Option C

Explanation:
η = 1 - T₂/T₁ = 1 - (300/400) = 1 - 0.75 = 0.25 = 25%. Wait, T₁ high temp 400 K, T₂ low 300 K, so η = 1 - 300/400 = 0.25 = 25%. Option A is 25%. Let's correct answer A. I'll set option A: 25%.
This question belongs to: Science Physics
Question #3
Ultrasound frequencies are typically above
A. 20 Hz
B. 200 Hz
C. 20000 Hz
D. 2000 Hz
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Correct Answer: Option C

Explanation:
Human hearing range is about 20 Hz to 20 kHz. Sound above 20 kHz is ultrasound. Infrasound is below 20 Hz. Ultrasound used in medical imaging (sonography), cleaning, SONAR.
This question belongs to: Science Physics
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